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><A
NAME="CATALOG-PG-OPFAMILY"
>45.33. <TT
CLASS="STRUCTNAME"
>pg_opfamily</TT
></A
></H1
><P
>   The catalog <TT
CLASS="STRUCTNAME"
>pg_opfamily</TT
> defines operator families.
   Each operator family is a collection of operators and associated
   support routines that implement the semantics specified for a particular
   index access method.  Furthermore, the operators in a family are all
   <SPAN
CLASS="QUOTE"
>"compatible"</SPAN
>, in a way that is specified by the access method.
   The operator family concept allows cross-data-type operators to be used
   with indexes and to be reasoned about using knowledge of access method
   semantics.
  </P
><P
>   Operator families are described at length in <A
HREF="xindex.html"
>Section 35.14</A
>.
  </P
><DIV
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><P
><B
>Table 45-33. <TT
CLASS="STRUCTNAME"
>pg_opfamily</TT
> Columns</B
></P
><TABLE
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><COL><COL><COL><COL><THEAD
><TR
><TH
>Name</TH
><TH
>Type</TH
><TH
>References</TH
><TH
>Description</TH
></TR
></THEAD
><TBODY
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>opfmethod</TT
></TD
><TD
><TT
CLASS="TYPE"
>oid</TT
></TD
><TD
><TT
CLASS="LITERAL"
><A
HREF="catalog-pg-am.html"
><TT
CLASS="STRUCTNAME"
>pg_am</TT
></A
>.oid</TT
></TD
><TD
>Index access method operator family is for</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>opfname</TT
></TD
><TD
><TT
CLASS="TYPE"
>name</TT
></TD
><TD
>&nbsp;</TD
><TD
>Name of this operator family</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>opfnamespace</TT
></TD
><TD
><TT
CLASS="TYPE"
>oid</TT
></TD
><TD
><TT
CLASS="LITERAL"
><A
HREF="catalog-pg-namespace.html"
><TT
CLASS="STRUCTNAME"
>pg_namespace</TT
></A
>.oid</TT
></TD
><TD
>Namespace of this operator family</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>opfowner</TT
></TD
><TD
><TT
CLASS="TYPE"
>oid</TT
></TD
><TD
><TT
CLASS="LITERAL"
><A
HREF="catalog-pg-authid.html"
><TT
CLASS="STRUCTNAME"
>pg_authid</TT
></A
>.oid</TT
></TD
><TD
>Owner of the operator family</TD
></TR
></TBODY
></TABLE
></DIV
><P
>   The majority of the information defining an operator family is not in its
   <TT
CLASS="STRUCTNAME"
>pg_opfamily</TT
> row, but in the associated rows in
   <A
HREF="catalog-pg-amop.html"
><TT
CLASS="STRUCTNAME"
>pg_amop</TT
></A
>,
   <A
HREF="catalog-pg-amproc.html"
><TT
CLASS="STRUCTNAME"
>pg_amproc</TT
></A
>,
   and
   <A
HREF="catalog-pg-opclass.html"
><TT
CLASS="STRUCTNAME"
>pg_opclass</TT
></A
>.
  </P
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